JP2009100682A - Rice transplanter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique for securing the transmission of driving power to a ground-leveling device without installing a single-purpose PTO driving mechanism in a transmission case in a rice transplanter equipped with the ground-leveling device for leveling a field surface by rotational motion at the front side of a transplanting part. <P>SOLUTION: The structure for taking out the rotational driving power of the ground-leveling device 51 from a rear axle case 11 for supporting the drive of rear wheels 12 is adopted. The driving power is transmitted to the ground-leveling device 51 by branching the power from an intermediate shaft (a rear intermediate shaft 24) at the upstream side of the power transmission based on a final transmission shaft (a rear axle 14) for driving the rear wheels 12 in the rear axle case 11. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a technique for ensuring drive transmission to a leveling device without providing a dedicated PTO drive mechanism in a mission case in a rice transplanter equipped with a leveling device for leveling a farm scene in front of a planting unit. .

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

  According to the “Patent Document 1”, the drive transmission mechanism to the leveling device is provided in the left and right center part of the rear part of the mission case, and the PTO output shaft provided in the drive transmission mechanism is extended rearward through the universal joint. And connected to the input shaft of the leveling device. Therefore, in this case, it is necessary to provide a drive transmission mechanism in the mission case, which increases the size of the mission case, which is an obstacle to constructing a compact aircraft layout excellent in economy.

  In particular, in the small Shijo class rice transplanter, the “minimum ground height” is lower than the relatively large rice transplanter, and there is a PTO output shaft for driving the planting part near the center of the mission case. Therefore, when extending the PTO output shaft for leveling equipment in the vicinity of the left and right center of the transmission case and from the rear to the rear, there is no space, and there is a drive transmission mechanism in the transmission case. It was difficult to provide.

  In addition, since the “minimum ground height” is low in the small Shijo-class rice transplanters, when the drive transmission mechanism is provided in the transmission case, the PTO output shaft is provided in a lower position and interferes with obstacles from below the field. There was a fear.

  Therefore, the problem to be solved by the present invention is that in a rice transplanter equipped with a leveling device for leveling a farm scene by rotational motion in front of the planting unit, the leveling is performed without providing a dedicated PTO drive mechanism in the mission case. It is to provide a technique for ensuring drive transmission to the apparatus.

  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 from the intermediate shaft on the upper side of power transmission to the final transmission shaft for driving the rear wheels in the rear axle case, and the driving force is transmitted 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 covers both left and right ends of the middle case body, and one of the outer case bodies has an opening. And the end of the intermediate shaft passes through the opening in the outer direction of the outer case body, and the driving force of the leveling device is taken out.

  According to a third aspect of the present invention, an intermediate case is provided between the one outer case body and the rear wheel, and the intermediate case extends obliquely upward in the front direction of the machine body in a side view and then the machine body in a plan view. It extends inward in the left-right direction, and further extends rearward so as to straddle the portion through which the intermediate shaft of the rear axle case is inserted, and the final output shaft is taken out.

  According to a fourth aspect of the present invention, the intermediate case extends obliquely upward in the forward direction of the body in a side view, a second case disposed in parallel with the rear axle case, and extends in the rear direction of the body. And a third case, and a switching means for connecting and disconnecting the rotational driving force of the leveling device is provided in the first case.

  As effects of the present invention, the following effects can be obtained.

  In claim 1, even if a dedicated PTO drive mechanism is not provided in the transmission case having the rear axle case, a drive source for the leveling device can be secured, and the transmission case itself is prevented from being enlarged. be able to. Further, the leveling device needs to be rotated at a peripheral speed faster than that of the rear wheels in order to prevent the phenomenon that the leveling device scrapes the field scene due to “dragging in the field” with respect to the progress of the machine body. Therefore, in claim 1, since the rotational driving force is extracted from the speed increasing side of the transmission shaft for driving the rear wheel, that is, the intermediate shaft on the upper side of power transmission, the transmission intermediate portion up to the leveling device can be made compact. For example, the speed increasing / decreasing case (drive transmission mechanism) provided in the middle of the drive system can be reduced in size, which is economical.

  In the second aspect, similarly to the first aspect, the transmission case itself can be prevented from being enlarged and the conduction intermediate portion can be made compact, which is economical.

  In the third aspect, the intermediate case is disposed between the rear wheel and the rear axle case, and is provided so as to straddle the upper portion of the rear axle case. The drive transmission mechanism to the leveling device can be protected against obstacles.

  According to the fourth aspect of the present invention, since the clutch mechanism which is the switching means is provided at a relatively low rotational speed portion on the transmission side of the leveling device, the on / off switching operation can be performed smoothly. Further, since the clutch mechanism is disposed obliquely above the rear axle case, it is easy for an operator to reach from the outside of the rear wheel, and fine adjustment and maintenance work can be easily performed.

  Next, embodiments of the invention will be described.

  1 is a side view showing the overall structure of a rice transplanter according to an embodiment of the present invention, FIG. 2 is a plan sectional view showing the entire rear axle case, and FIG. 3 is a sectional plan view showing a power take-out mechanism to a leveling device, FIG. 4 is a side cross-sectional view as seen from the direction of arrow B shown in FIG. 3, FIG. 5 is a perspective view of the vicinity of the power take-out mechanism to the leveling device as seen from above the front oblique direction, and FIG. FIG.

[Overall configuration of rice transplanter 1]
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.

  As shown in FIG. 1, the rice transplanter 1 includes a traveling unit 2 and a planting unit 3, and the planting unit 3 is connected to the rear part of the traveling unit 2 so as to be movable up and down by an elevating mechanism 4. The traveling unit 2 includes a body frame 5, an engine is mounted in a bonnet 7 provided at the front thereof, and a traveling mission 8 is disposed below.

  A front axle case (not shown) is disposed on both the left and right sides of the traveling mission 8, 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.

  The engine and the traveling mission 8 are interlocked and connected via a transmission belt, and the traveling mission 8 and the front wheel 10 are interlocked and connected via a power transmission mechanism in the front axle case. The mission 8 and the rear wheel 12 are interlocked and connected via a transmission mechanism in the traveling mission 8 and a power transmission mechanism in the rear axle case 11.

  In the present embodiment, the transmission case 6 (see FIG. 2) and the rear axle case 11 are integrally formed. In the transmission case having such a configuration, the engine power is the front. It is transmitted to the wheel 10 and the rear wheel 12.

  That is, the power of the engine is transmitted to the traveling mission 8, and then the power shifted by the traveling mission 8 is transmitted to the front wheels 10 and the rear wheels 12, respectively, and the front wheels 10 and the rear wheels 12 are driven. It is configured to be. Thereby, the traveling unit 2 can travel forward or backward. The transmission case 6 and the rear axle case 11 described above may be formed separately. In this case, a drive shaft or the like is connected to the rear axle case 11 side from the transmission case 6 to drive the engine power to the rear wheel 12. It is good also as a structure transmitted to the side.

  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, a shift pedal for performing a shifting operation of the traveling unit 2, and the like are provided at the front, and a seat 17 is provided at the rear. Various operations can be performed on the traveling unit 2 or the planting unit 3.

  The planting unit 3 is composed of a planting frame body including a planting frame 21, a planting mission 22, a transmission shaft case 23, a planting transmission case 25, and the like. Is disposed, and a planting mission 22 is provided at the center lower portion 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.

  Here, on the planting frame 21, a rotation support shaft 55 is horizontally mounted 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. And the leveling apparatus 51 is supported by the lower end part of this support material 57, and the leveling apparatus 51 is movable up and down when the support material 57 moves 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 performed by the leveling device 51.

[Rear axle case 11]
Next, details of the rear axle case 11 having the power take-out mechanism 35 according to the present invention will be described with reference to FIG. 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. In each of the left and right sides of the rear axle case 11, a rear intermediate shaft 24 and a rear axle 14 are horizontally mounted in parallel in the front-rear direction, and both shafts 24 and 14 are interlocked via gears. The

  The rear intermediate shaft 24 is disposed on the upper transmission side with respect to the rear axle 14, and a rear intermediate gear 26 is fixed to the front end portion of the vehicle body, and at the same time, the rear axle case 11 is rotated via a bearing 33. It is supported freely. 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. Further, the rear intermediate shaft 24 disposed on one of the left and right sides of the rear axle case 11, that is, the left side in this embodiment, is supported by the bearing 34 and then passes through the outer case body 11 b to the outside. Is protruding.

  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 addition, a circular opening 11d is provided at a location where the rear intermediate shaft 24 of the outer case body 11b is disposed, and the rear intermediate shaft 24 is supported by the opening 11d via a bearing 34. The end portion protrudes outward. A sprocket 38 is fixed to the tip of the outer projecting portion of the rear intermediate shaft 24 so that power can be taken out via a power take-out mechanism 35 described later.

  Here, the arrangement of the power take-out mechanism 35 is not limited to the left side of the rear axle case 11 as in the present embodiment, but may be on the right side. In this embodiment, since the PTO transmission shaft 66 for driving the planting part 3 is provided on the right side of the rear axle case 11, in order to balance left and right and to avoid interference with the PTO transmission shaft 66. The power take-out mechanism 35 is arranged on the left side.

  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.

  In this way, the rear axle case 11 is configured. When the driving force of the engine is transmitted, the rear axle case 11 is first transmitted to the rear intermediate shaft 24 via the rear intermediate gear 26 and then to the rear gear 30 via the final gear 30. The driving force is transmitted to the axle 14, and the rear wheel 12 is driven to rotate. As described above, from the left and right sides of the rear axle case 11, the outer case body 11b is penetrated and the end portion of the rear intermediate shaft 24 is projected to extract the driving force of the engine from the projected portion. Is possible.

  Accordingly, the rotational driving force of the leveling device 51 is taken out from the rear axle case 11 that drives and supports the rear wheel 12, and the power is applied to the final transmission shaft (rear axle 14) for driving the rear wheel 12 in the rear axle case 11. A dedicated PTO drive mechanism is provided in the transmission case 6 having the rear axle case 11 to divide the power from the intermediate shaft (rear intermediate shaft 24) on the upper transmission side and transmit the driving force to the leveling device 51. Even if it is not, the drive source to the leveling device 51 can be secured, and the enlargement of the transmission case 6 itself can be prevented. Further, the leveling device 51 needs to be rotated at a higher peripheral speed than the rear wheel 12 in order to prevent the phenomenon that the leveling device 51 scrapes the field scene due to “dragging in the farm scene” with respect to the progress of the machine body. At a certain point, since the rotational driving force is taken out from the rear intermediate shaft 24 on the speed increasing side of the rear axle 14, that is, the upper side of power transmission, the conductive intermediate portion leading to the leveling device 51 can be made compact and economical. Is.

  The rear axle case 11 includes a middle case body 11a extending in the left-right direction and outer case bodies 11b and 11b that close both left and right ends of the middle case body 11a. In order to take out the driving force of the leveling device 51 by providing an opening 11d on the outer side and passing the end of the rear intermediate shaft 24 through the opening 11d toward the outside of the outer case body 11b. Similarly to the above, the transmission case 6 itself can be prevented from being enlarged, and the conduction intermediate portion can be made compact, which is economical.

[Power take-off mechanism 35]
Next, details of the power take-off mechanism 35 according to the present invention will be described with reference to FIGS. 2 to 6. In the following description, the direction of arrow A shown in the figure is the forward direction.
The power take-out mechanism 35 is a mechanism for taking out a part of the driving power for the rear wheel 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 rear 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 includes a sprocket 38 fixed to an outer protrusion of the rear intermediate shaft 24, a power transmission shaft 19 disposed in parallel to the rear intermediate shaft 24, and a sprocket disposed at one end of the power transmission shaft 19. 39, a drive chain 20 wound between the sprocket 39 and the sprocket 38, an output shaft 9 for leveling connected by driving via a bevel gear 36 fixed to the other end of the power transmission shaft 19, The clutch mechanism 37 that switches the transmission of power to the leveling output shaft 9 and the intermediate case 18 that holds these components and protects them from external impacts and the like are provided.

  The power transmission shaft 19 is provided in the left-right direction parallel to the rear intermediate shaft 24, and is disposed above the front axle case 11 of the rear axle case 11. A sprocket 39 is pivotally supported at the left end of the power transmission shaft 19 and is connected to the rear intermediate shaft 24 via the drive chain 20. On the other hand, a bevel gear 36 is fixed to the right end of the power transmission shaft 19 and meshes with a bevel gear 40 provided on the leveling output shaft 9.

[Clutch mechanism 37]
A clutch mechanism 37 is provided between the sprocket 39 and the power transmission shaft 19 so that the driving force taken out from the rear intermediate shaft 24 can be easily connected and disconnected. However, it is also possible to arrange a clutch mechanism between the power transmission shaft 19 and the bevel gear 36 or between the sprocket 38 and the rear intermediate shaft 24. 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.
Here, the clutch mechanism 37 will be described with reference to FIGS. 3 and 4. The clutch mechanism 37 includes a sliding body 45, a fork body 46, an operation lever 47, and the like.

  The sliding body 45 is formed of a cylindrical member, and is spline-fitted to the left end portion of the power transmission shaft 19 so as to be slidable in the axial direction but not relatively rotatable. A claw portion 45 a is provided on the end of the sliding body 45 on the sprocket 39 side, while a claw portion 39 a that engages with the claw portion 45 a is formed on the sliding body 45 side of the sprocket 39. The sprocket 39 is pivotally supported on the power transmission shaft 19 via a bush 41.

  In the inner periphery of the sliding body 45, the side where the cut-off portion 19 a of the power transmission shaft 19 is provided, that is, between the right side shown in FIG. 3 and the cut-off portion 19 a provided on the power transmission shaft 19. A compression spring 48 is provided, and the sliding body 45 is always urged toward the sprocket 39 by the compression spring 48. On the other hand, a fitting groove 45b is formed in the outer peripheral portion of the claw portion 45a of the sliding body 45, and the fork body 46 is fitted in the fitting groove 45b.

  The base of the fork body 46 is fixed to one side of the lever shaft 47a of the operating lever 47, and the other end of the lever shaft 47a passes through the intermediate case 18 and protrudes forward and outward. The case 18 is pivotally supported so as to be rotatable.

  In such a configuration, when the operating lever 47 is rotated to engage the claw portion 45a of the sliding body 45 and the claw portion 39a of the sprocket 39, the clutch mechanism 37 becomes "contact" and the rear intermediate shaft 24 and the sprocket 38 are engaged. The power is transmitted from the drive chain 20, the sprocket 39, and the sliding body 45 to the power transmission shaft 19. Further, when the operation lever 47 is rotated in the reverse direction, the sliding body 45 is slid against the urging force of the compression spring 48, the engagement between the claw portion 45a and the claw portion 39a is released, and the sprocket 39 is driven by power. This causes idling on the transmission shaft 19 and the driving force from the rear axle case 11 is cut off.

  Further, a connecting pin 49 is inserted into the upper end portion of the operation lever 47, and one end of an interlocking wire 50 (see FIGS. 5 and 6) is connected to the connecting pin 49.

  The other end of the interlocking wire 50 is extended to the planting part 3 side, and is connected to a wire connecting piece 55a (see FIG. 1) provided on a rotation support shaft 55 for raising and lowering the leveling device 51. When the elevating operation lever 56 provided in the planting part 3 is rotated to lower the leveling device 51 to the working position, the clutch mechanism 37 becomes “contact” and power is transmitted as described above. It is said. The interlocking wire 50 is supported on the way by a support member 53 fixed to the intermediate case 18, and the outside is covered with an outer wire 54.

  That is, when the elevating operation lever 56 is rotated rearward, as described above, the leveling device 51 is lowered via the support member 57, and at the same time, the tensile force applied to the interlocking wire 50 is released, and the sliding body 45 is compressed spring. 48 is biased toward the sprocket 39 side, and the driving force is transmitted to the power transmission shaft 19. Further, when the elevating operation lever 56 is rotated forward, the leveling device 51 is raised via the support member 57, and the operation lever 47 is rotated toward the center of the machine body via the interlocking wire 50. Then, the interlocking wire 50 is pulled, and the sliding body 45 is pushed to the compression spring 48 side by the fork body 46, and the drive transmission to the power transmission shaft 19 is cut off.

  Next, the arrangement configuration of the power transmission shaft 19 and the leveling output shaft 9 will be described. As described above, the power transmission shaft 19 is provided along the left-right direction of the fuselage above the rear axle case 11, and the left end portion thereof is substantially the same as the left end portion of the rear intermediate shaft 24 in the left-right direction in plan view. On the other hand, the right end is provided to extend horizontally toward the center of the vehicle body.

  A leveling output shaft 9 is disposed in the vicinity of the right end of the power transmission shaft 19. The leveling output shaft 9 is orthogonal to the power transmission shaft 19 in a plan view and downwardly obliquely in a side view. In a state inclined to the rear, it is provided to extend rearward.

  A bevel gear 40 is fixed to the front end portion of the leveling output shaft 9 and meshes with a bevel gear 36 provided at the right end portion of the power transmission shaft 19.

  The intermediate case 18 includes a first case body 58 that covers and supports the space from the end of the rear intermediate shaft 24 to the end of the power transmission shaft 19, and a second case body 59 that covers and supports the power transmission shaft 19. And a third case body 60 that covers and supports the leveling output shaft 9, and these case bodies 58, 59, and 60 are each assembled by bolts or the like.

  The first case body 58 is a box-shaped case body having a substantially rectangular shape or an elliptical shape in a side view, and is arranged on the left side of the rear axle case 11 so as to extend upward in the front oblique direction. It is assembled to the outer case body 11b via bolts or the like by support portions 58c and 58c protruding rearward from both upper and lower ends of the end.

  The first case body 58 is divided into right and left sides in plan view, and the main body 58a disposed on the center side of the body and the outer lid 58b disposed on the outside of the body are detachable from each other via bolts or the like. Is fixed.

  In the rear part of the main body 58a, a substantially cylindrical protruding part 58f is provided on the side surface on the rear axle case 11 side, and the end of the rear intermediate shaft 24 protruding outside through the outer case body 11b It is inserted into the inside of the first case body 58 through the protruding portion 58f.

  In addition, a rectangular bulging portion 58d is provided on the side surface on the rear axle case 11 side at the front portion of the main body portion 58a, and one end portion of the power transmission shaft 19 is inserted through a through hole 58e in the center portion. At the same time, the above-described clutch mechanism 37 is disposed.

  As described above, the intermediate case 18 has a first case body 58 extending obliquely upward in the front direction of the airframe in a side view, a second case body 59 disposed in parallel with the rear axle case 11, and a rearward direction of the airframe. A switching means (clutch mechanism 37) for connecting and disconnecting the rotational driving force of the leveling device 51 is provided at the front portion of the first case body 58. Since the clutch mechanism 37 serving as the switching means is provided at a relatively low rotational speed on the transmission side of the leveling device 51, the on / off switching operation can be performed smoothly. Further, since the clutch mechanism 37 is disposed obliquely above the rear axle case 11, it is easy for an operator to reach from the outside of the rear wheel 12, and fine adjustments and maintenance work can be easily performed.

  Bearings 61, 61... Are fixed to the front and rear portions inside the first case body 58 using the wall portions of the main body portion 58a and the outer lid portion 58b. 24 and the end of the power transmission shaft 19 are respectively pivotally supported via the bearings 61, 61... The drive chain 20 is wound through the sprockets 38 and 39 and connected to drive.

  Thus, the thickness of the first case body 58, that is, the lateral width in plan view, is sufficient if a sufficient dimension can be secured to arrange the sprockets 38 and 39 and the bearings provided between the shafts 19 and 24. Therefore, the first case body 58 can be provided between the rear axle case 11 and the rear wheel 12 without projecting greatly in the lateral direction of the airframe, and the second and third case bodies 59 and 60 are respectively provided as described later. Since the first case body 58 is provided on the machine body center side, the intermediate case 18 as a whole can be disposed on the inner side in the machine direction from the rear wheel 12.

  A second case body 59 is fixedly provided at the center of the bulging portion 58d at the front of the first case body 58. The second case body 59 is formed of a cylindrical case body, and plate members are passed through and fixed to both ends thereof. Further, both end portions of the second case body 59 extend slightly further after penetrating the plate member to form a protruding portion.

  The second case body 59 is disposed together with the power transmission shaft 19 and the central axis, and when the protruding portion of the end portion is inserted into the through hole 58e of the bulging portion 58d, via the plate member, The first case body 58 is fixed with bolts or the like.

  By assembling the second case body 59 with such a structure, the reproducibility of the assembly position of the second case body 59 with respect to the first case body 58 can be improved, and external impacts and the like can be In addition to the above, not only the protrusions at the ends are also held at the same time, and the rigidity can be increased. A third case body 60 is fixed to the other end of the second case body 59, and the second case body 59 is a support member that connects the first and third case bodies 58 and 60. As a role.

  The third case body 60 is formed of a substantially rectangular box member, and is disposed so as to extend backward in the longitudinal direction of the machine body in the front-rear direction and straddle the rear axle case 11. The front surface portion of the third case body 60 has a divided structure, and is constituted by an outer lid portion 60a made of the divided member and a main body portion 60b made of other members.

  Through holes 60c and 60d are respectively provided in the left side surface portion and the rear surface portion of the main body portion 60b, and the end portion of the second case body 59 is fixedly provided through the through hole 60c in the left side surface portion. In other words, the protruding portion at the end of the second case body 59 is inserted into the through hole 60c and, at the same time, fixed to the left side surface portion of the third case body 60 using a bolt or the like via the plate member.

  By assembling the second case body 59 with such a structure, the reproducibility of the assembly position of the second case body 59 with respect to the third case body 60 can be improved as described above, and from the outside. The impact or the like is simultaneously held not only by the bolt or the like but also by the protruding portion at the end portion, and the rigidity can be increased.

  A support member 64 extending toward the center of the machine body is provided at the upper right portion of the front surface of the outer lid portion 60a, and the front end portion thereof is fixed via a bracket 65 provided on the transmission case 6 and a bolt or the like. It is installed.

  Inside the main body 60b, a bearing 62 is fixed in the through hole 60d in the rear side surface, and a bearing 63 having the same axis as the bearing 62 is also provided on the inner surface of the outer lid 60a. The leveling output shaft 9 is pivotally supported via these bearings 62 and 63, and is disposed in the front-rear direction in a plan view, and the rear end portion projects rearward through the through hole 60d. Yes.

  Further, the end of the power transmission shaft 19 is inserted into the inside of the third case body 60 through the through hole 60c in the left side surface portion of the main body 60b, and the bevel gear 36 fixed to the end is inserted. The one end portion of the power transmission shaft 19 is pivotally supported by a bearing 69 provided in the through hole 60c.

  The right end of the leveling output shaft 9 is inserted into the inside of the third case body 60 from the left side in the airframe direction, and the front portion of the power transmission shaft 19 is inserted from the rear side in the airframe direction. The leveling output shaft 9 meshes with the bevel gear 36 of the power transmission shaft 19 through the bevel gear 40 provided, and is drive-coupled.

  As described above, the intermediate case 18 is provided between the left and right outer case bodies 11b of the rear axle case 11 and the rear wheel 12, and the intermediate case 18 extends obliquely upward in the front direction of the machine body in a side view. , Extending inward in the left-right direction of the machine body in plan view, and further extending rearward so as to straddle the portion through which the rear intermediate shaft 24 of the rear axle case 11 is inserted, and the output shaft 9 for leveling, which is the final output shaft By taking out rearward, it is possible to protect against an impact from the left and right direction and the lower direction of the intermediate case 18. That is, the impact from the outside in the left-right direction is protected by the rear wheel 12, the rear axle case 11, or the transmission case 6 provided at the front of the rear axle case 11, and the impact from the outside in the up-down direction. It is protected by the rear axle case 11 and the machine body frame 5 disposed further upward.

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 plane sectional view showing the power extraction mechanism to the leveling device. Side surface sectional drawing seen from the arrow B direction similarly shown in FIG. The perspective view which looked at the vicinity of the power taking-out mechanism to the leveling apparatus from the front oblique upper direction. The perspective view similarly seen from the back oblique upper direction.

Explanation of symbols

6 Transmission case 9 Output shaft for leveling 11 Rear axle case 11a Middle case body 11b Outer case body 11c Opening portion 11d Opening portion 12 Rear wheel 14 Rear axle 18 Intermediate case 19 Power transmission shaft 20 Drive chain 24 Rear intermediate shaft 24a Gear portion 26 Rear Intermediate gear 30 Final gear 33 Bearing 34 Bearing 35 Power take-out mechanism 36 Bevel gear 37 Clutch mechanism 38 Sprocket 39 Sprocket 47 Operation lever 51 Leveling device 58 First case body 58a Main body portion 58b Outer cover portion 58f Protruding portion 58d Swelling portion 58e Through hole 59 Second case body 60 Third case body 61 Bearing 64 Support member 66 PTO transmission shaft 68 Side clutch mechanism

Claims (4)

  In the 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 structured to be taken out from the rear axle case that drives and supports the rear wheel, A rice transplanter characterized in that power is branched from an intermediate shaft on the upper side of power transmission with respect to a final transmission shaft for driving rear wheels, and driving force is transmitted 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. One of the outer case bodies is provided with an opening, and the opening 2. The rice transplanter according to claim 1, wherein an end portion of the intermediate shaft is penetrated in an outer side direction of the outer case body to take out a driving force of the leveling device.   An intermediate case is provided between the one outer case body and the rear wheel. The intermediate case extends obliquely upward in the front direction of the machine body in a side view and then extends inward in the left-right direction of the machine body in a plan view. The rice transplanter according to claim 1 or 2, further comprising a rear axle extending rearward so as to straddle a portion through which the intermediate shaft of the rear axle case is inserted, and taking out a final output shaft. .   The intermediate case includes a first case that extends obliquely upward in the front direction of the aircraft in a side view, a second case that is disposed in parallel with the rear axle case, and a third case that extends in the rear direction of the aircraft. 4. The rice transplanter according to claim 3, wherein the first case is provided with a switching means that is configured in series and connects and disconnects the rotational driving force of the leveling device.

Images