JP2013198458A - Seedling-planting apparatus of rice transplanter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lightly perform operation of odd row planting clutches, while performing transmission to planting drive shafts with rotation transmission shafts in planting drive cases and disposing the odd row planting clutches and torque limiters on the rotation transmission shafts.SOLUTION: A rotation transmission shaft 43 for interlocking transmission shaft 42 placed at the front end portion of a planting drive case 11 with a planting drive shaft 20 placed at the rear end portion of the planting drive case 11 is disposed in the inside of the planting drive case 11. An odd row planting clutch 50 is disposed at the front end portion of rotation transmission shaft 43, and torque limiter 70 is disposed at the rear end portion of the rotation transmission shaft 43.

Description

  The present invention relates to a seedling planting apparatus for a rice transplanter including a plurality of planting front and rear planting drive cases arranged in a lateral direction of the machine body, and a seedling planting mechanism that is movably provided at a rear end portion of the plurality of planting drive cases.

  Conventionally, as shown in Patent Document 1, a pair of left and right transmission pipes extending rearward from a horizontal connection pipe in the left-right direction, and a cross joint connected to the rear end of each transmission pipe via a planting arm shaft There was a planting part of a rice transplanter equipped with a rotary planting device supported so as to be freely driven. The planting portion includes a transmission shaft provided inside the transmission pipe so as to transmit the driving force of the coupling shaft located on the coupling pipe to the planting arm shaft, and a safety clutch provided at a position near the coupling shaft in the transmission shaft. A unit clutch provided at a portion of the transmission shaft near the planting arm shaft is provided.

JP 2002-305924 A

  In the seedling planting device of the rice transplanter described above, a rotational transmission shaft that transmits the driving force transmitted to the front end side of the planting drive case to the planting drive shaft is provided inside the planting drive case, By providing a torque limiter, the seedling planting mechanism supported by each planting drive case can be arbitrarily driven and stopped separately from the seedling planting mechanism supported by other planting drive cases, and When the above-mentioned conventional technology is applied so that transmission can be cut off automatically in the event of an overload, the fractional planting clutch will be located closer to the planting drive shaft than the torque limiter. The distance between the line-planting clutch and the front of the seedling planting device and the operation tool deployed in front of the seedling planting device tends to be long, and the clutch operation tends to be heavy. Was Tsu.

  An object of the present invention is to perform transmission to a planting drive shaft in a planting drive case by a rotary transmission shaft, and to install a fractional planting clutch and a torque limiter on the rotational transmission shaft, while lightening the operation of the fractional planting clutch. The object is to provide a planting device for rice transplanters that can be used.

The first aspect of the present invention is a seedling planting device of a rice transplanter comprising a plurality of planting front and rear planting drive cases arranged in a lateral direction of the machine body, and a seedling planting mechanism that is movably provided at a rear end of the plurality of planting drive cases. ,
In each of the plurality of planting drive cases, a transmission shaft located at the front end of the planting drive case and a planting drive shaft located at the rear end of the planting drive case for driving the seedling planting mechanism are linked. A rotary transmission shaft, a fraction-planting clutch provided at a front end portion of the rotary transmission shaft so as to switch transmission from the transmission shaft to the rotary transmission shaft between an on state and a cut-off state, the rotary transmission shaft and the planting drive shaft A torque limiter provided at the rear end of the rotary transmission shaft is provided so as to switch between the interlocking state and the interlocking cut-off state.

  According to the configuration of the first aspect of the invention, the fractional row planting clutch is located on the opposite side of the torque limiter from the side on which the planting drive shaft is located, and the fractional row planting clutch and the front part of the seedling planting device The distance from the operation tool deployed on the front side of the seedling planting device can be made shorter than when the conventional technique is applied.

  Therefore, the operation structure of the fraction-planting clutch can be made a simple structure in which the distance between the fraction-planting clutch and the operation tool is short, and the operating force required for switching the fraction-planting clutch can be lightened.

  In the second aspect of the invention, the fractional planting clutch includes a driven-side clutch body that is engaged with the spline portion of the rotary transmission shaft so as to be integrally rotated and slidable by the spline portion, and the torque limiter is configured as follows. A drive-side clutch body engaged with the spline portion of the rotation transmission shaft so as to be integrally rotated and slidable by the spline portion, the spline portion of the driven-side clutch body, and the drive-side clutch body of the drive-side clutch body The spline module is set to be the same.

  According to the configuration of the second aspect of the invention, the spline portion of the rotation transmission shaft engaged with the driven side clutch body of the fraction planting clutch, and the spline portion of the rotation transmission shaft engaged with the drive side clutch body of the torque limiter, It can be formed by using a common tool and manufacturing method.

  Therefore, the rotary transmission shaft can be easily manufactured from the surface of forming the spline portion and can be obtained at a low cost, while the fractional planting clutch and the torque limiter are provided on the rotary transmission shaft.

  According to a third aspect of the present invention, a lubricating oil supply port is provided at a wall portion facing the rear of the machine body of the planting drive case at the same or higher arrangement height with respect to the axis of the planting drive shaft. Rice transplanter seedling planting equipment as described

  According to the configuration of the third aspect of the invention, in order to supply the lubricating oil to the planting drive case, it is possible to secure a working space that is advantageous for the supply work, such as the seedling planting mechanism is less likely to become an obstacle at the rear side of the machine body of the lubricating oil supply port. And the oil level height of the lubricating oil contained in the planting drive case can be supplied so as to be at least the same as the height of the planting drive shaft.

  Therefore, in order to supply the lubricating oil to the planting drive case, it is possible to work easily and efficiently in an advantageous work space, and the oil level of the supplied lubricating oil is at least the same as the arrangement height of the planting drive shaft. It can supply so that supply may not become insufficient.

It is a side view which shows a seedling planting apparatus. It is a top view which shows a seedling planting apparatus. It is a side view which shows a planting drive case and a seedling planting mechanism. It is a cross-sectional top view of a feed case. It is a vertical side view of a feed case. It is a cross-sectional top view which shows a planting drive case and a seedling planting mechanism. It is a cross-sectional top view which shows a fraction row planting clutch. It is a cross-sectional top view which shows a torque limiter. It is the IX-IX cross section arrow view of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing a seedling planting apparatus 1 of a rice transplanter according to an embodiment of the present invention. FIG. 2 is a plan view showing the seedling planting apparatus 1 according to the embodiment of the present invention. As shown in FIGS. 1 and 2, a rice transplanter seedling planting apparatus 1 according to an embodiment of the present invention constitutes a riding type rice transplanter, and moves backward and upward from a riding type self-propelled body (not shown). A body frame 2 having a front end connected to a support member 5 positioned at the rear of the link mechanism 4 extending so as to be swingable, and eight seedlings that are provided in the rear of the body frame 2 so as to be driven in the lateral direction of the body. Mechanism 6, one seedling platform 7 provided in an inclined position located on the rear side of the machine body at the lower end above the front part of the machine frame 2, and five grounding floats arranged side by side in the machine body below the machine frame 2 8 is provided.

  The seedling planting device 1 is moved into a descending working state in which each grounding float 8 comes into contact with the farm scene and an ascending non-working state in which each grounding float 8 rises high from the farm scene by the vertical swing operation of the link mechanism 4 with respect to the traveling machine body. By being lifted and lowered and pulled by the self-propelled aircraft in the descending state, the ground scene is leveled by the grounding float 8, and eight seedlings are planted by the eight seedling planting mechanisms 6 on the leveled field scene.

  The seedling planting device 1 is supported by a support member 5 so as to be swingable around a rolling axis center in the longitudinal direction of the aircraft, so that the right and left seedling planting depths are the same or substantially the same regardless of the right and left inclination of the self-propelled aircraft. Planting seedlings while rolling against the self-propelled aircraft.

The body frame 2 will be described.
As shown in FIGS. 1, 2, and 3, the fuselage frame 2 has a mainframe 10 that is located at the front end of the fuselage frame 2 and is long in the lateral direction of the fuselage. An extending planting drive case 11 and a feed case 12 connected to an intermediate portion of the main frame 10 in the lateral direction of the machine body are provided. The main frame 10 is configured by a hollow member having a rectangular longitudinal cross-sectional shape.

  FIG. 4 is a cross-sectional plan view of the feed case 12. FIG. 5 is a vertical side view of the feed case 12. As shown in FIGS. 1, 4, and 5, the feed case 12 includes an input shaft 13, and a feed case main body 12 a that houses the speed change mechanism 14. An output case portion 12b extending is provided. On the wall surface 12c facing forward of the fuselage of the feed case body 12a, there are a connecting shaft 15 projecting forward of the fuselage, a lubricating oil supply port 16 located at the same or substantially the same height as the input shaft 13, and a lubricating oil supply port 16. A plug 17 that opens and closes is provided. The connecting shaft 15 is connected to the support member 5 so as to be rotatable around the rolling axis, and enables the seedling planting apparatus 1 to roll. A pedestal portion 12d connected to the main frame 10 is provided at the bottom of the feed case body 12a.

The seedling planting mechanism 6 will be described.
FIG. 3 is a side view showing the planting drive case 11 and the seedling planting mechanism 6. FIG. 6 is a cross-sectional plan view showing the planting drive case 11 and the seedling planting mechanism 6. As shown in FIGS. 2, 3, and 6, the eight seedling planting mechanisms 6 are arranged in the lateral direction of the machine body in an arrangement that is positioned one by one on both lateral sides of the rear end portion of each planting drive case 11. A pair of seedling planting mechanisms 6 and 6 positioned separately on both lateral sides of each planting drive case 11 are attached to a single planting drive shaft 20 penetrating in the lateral direction of the machine body at the rear end of the planting drive case 11. It is supported by the planting drive case 11 via the planting drive shaft 20 so as to be freely driven.

  Each seedling planting mechanism 6 includes a rotary rotor 6a that is rotatably supported by a portion of the planting drive shaft 20 that protrudes outside the planting drive case 11, and both ends of the rotary rotor 6a via rotary drive shafts 6b. It is provided with the planting arm 6c supported so that it can drive freely. In other words, each seedling planting mechanism 6 is driven by the gear mechanism 6e located inside the rotary rotor 6a by the rotary rotor 6a being rotationally driven by the planting drive shaft 20. The arms 6c and 6c are driven to rotate around the axis of the rotational drive shaft 6b while revolving around the axis of the planting drive shaft 20.

  Accordingly, in each seedling planting mechanism 6, when the planting drive shaft 20 is driven, the planting claw 6d provided on one planting arm 6c and the planting claw 6d provided on the other planting arm 6c are combined with each other. While drawing a turning trajectory T (see FIG. 3) as a seedling planting movement trajectory at the tip, it alternately moves up and down between the seedling take-out port 21 located on the lower end side of the seedling mount 7 and the field scene. To plant seedlings. Accordingly, each seedling planting mechanism 6 alternately takes out one seedling from the mat-like seedling of the seedling placing stand 7 at the seedling takeout port 21 by the pair of planting claws 6d, 6d, and the taken out seedling is taken out as the seedling takeout port 21. Planted down to the field. The seedlings that the seedling planting mechanism 6 takes out from the seedling platform 7 and transports it downward are guided by the seedling guide 9 (see FIG. 1) so as to go to the field scene.

The seedling supply to each seedling planting mechanism 6 will be described.
A seedling placing portion (not shown) is provided on the surface side of the seedling placing stand 7, and mat seedlings to be supplied to the eight seedling placing mechanisms 6 are placed in this seedling placing portion side by side in the horizontal direction of the machine body. It is constituted as follows. As shown in FIGS. 1, 2, and 3, the seedling platform 7 is placed on the side of the machine body by a seedling platform column 23 that supports the upper end side of the seedling platform 7 and a guide rail 24 that supports the lower end side of the seedling platform 7. It is supported movably in the direction.

  The seedling stage 7 is reciprocated in the lateral direction of the machine body in conjunction with the seedling planting movement of the seedling planting mechanism 6 by a seedling lateral feed drive device 25 (see FIG. 2) located on the back side of the seedling stage 7. This seedling removal is performed from one end side to the other end side in the lateral direction of the mat-like seedling so that the planting mechanism 6 takes out one seedling from the lower end portion of the mat-like seedling placed on the seedling placement portion. The mat-like seedlings to be supplied to each seedling planting mechanism 6 are reciprocated in the lateral direction of the machine body with respect to the seedling outlet 21 provided in the guide rail 24 so as to be sequentially performed.

  A seedling vertical feed belt 26 is provided on the back side of the lower portion of the seedling mount 7. The seedling vertical feed belt 26 is set and rotated by a seedling vertical feed drive device 27 (see FIG. 2) located on the back side of the seedling stage 7 when the seedling stage 7 reaches the left and right strotalk ends of the lateral transfer. A mat-like seedling for each seedling planting mechanism 6 driven by the stroke and placed on the seedling placement unit is vertically fed toward the seedling takeout port 21.

The work transmission device 3 that drives the seedling planting mechanism 6, the seedling lateral feed drive device 25, and the seedling vertical feed drive device 27 will be described.
As shown in FIG. 2, the work transmission device 3 inputs the driving force from the engine (not shown) of the traveling machine body to the feed case main body 12 a of the feed case 12 by the input shaft 13 provided at the front portion of the feed case 12. Then, the input driving force is configured to be transmitted to the seedling lateral feed driving device 25 and the seedling vertical feed driving device 27 by the seedling feed driving unit 30, and the driving force input to the feed case main body 12a is transmitted to the planting driving unit. 31 is transmitted to the planting drive shaft 20 of the eight seedling planting mechanisms 6.

As shown in FIGS. 2 and 4, the seedling feed drive unit 30 includes a relay transmission shaft 34 and a seedling lateral feed drive device 25 that are linked via a relay bevel gear 33 to a bevel gear 32 that is provided to be rotatable integrally with the input shaft 13. It is configured to include a lateral feed output shaft 35 that is connected to an end of the seedling platform lateral feed shaft 25a to be configured to be integrally rotatable, and a speed change mechanism 14 that is provided across the relay transmission shaft 34 and the lateral feed output shaft 35. .
Therefore, the seedling feed drive unit 30 inputs the driving force from the engine input by the input shaft 13 to the speed change mechanism 14 via the bevel gear 32, the relay bevel gear 33, and the relay transmission shaft 34, and the rotational speeds are different in four stages. The gear is shifted to the driving force, and the driving force after the shifting is output from the lateral feed output shaft 35 to the seedling table lateral feed shaft 25a. Therefore, the seedling feed driving unit 30 shifts the driving speed of the seedling platform horizontal feed shaft 25a to four different driving speeds by the speed change mechanism 14, and the seedling platform horizontal feeding speed as the seedling horizontal feeding speed is set to four stages. change.

  The seedling feed drive unit 30 includes a longitudinal feed output shaft 37 connected to an end of a seedling vertical feed shaft 27 a constituting the seedling vertical feed drive device 27 so as to be integrally rotatable by a connecting pin 36, and one end portion of the vertical feed output shaft 37. And a transmission gear 39 provided so as to be integrally rotatable on the lateral feed output shaft 35 in mesh with the transmission gear 38, and driving the lateral feed output shaft 35. The force is transmitted to the vertical feed output shaft 37 through the transmission gear 39 and the transmission gear 38, and is output from the vertical feed output shaft 37 to the seedling vertical feed shaft 27a.

  As shown in FIGS. 2 and 4, the planting drive unit 31 includes the input shaft 13 and the relay transmission shaft 34, and the output wheel of the feed case 12 that is interlocked with the relay transmission shaft 34 by a gear interlocking mechanism 40. The output case portion 12b of the feed case 12 is connected to the center portion of the body 41 and the output wheel body 41 so that the left side of the output case portion 12b of the feed case 12 enters the front end portions of the left two planting drive cases 11 and 11. The right-hand side of the two right-side planting drive cases 11, 11 are arranged so that they enter the front end portions of the two planting drive cases 11, 11, and the transmission shaft 42 is installed in each planting drive case 11 so as to be interlocked with the planting drive shaft 20. The rotary transmission shaft 43 is provided.

  As shown in FIGS. 4 and 5, the output ring body 41 is constituted by a rotating gear, and the gear interlocking mechanism 40 is provided on the relay transmission shaft 34 so as to be integrally rotatable, and the upper side relay transmission gear 40 a and the upper side relay transmission. The lower relay transmission gear 40b meshed with the gear 40a and the output wheel body 41 is constituted. The upper side relay transmission gear 40a and the lower side relay transmission gear 40b are rotatably supported by the output case portion 12b of the feed case 12.

  As shown in FIG. 4, the output wheel body 41 includes a wheel body main body 41 a interlocked with the lower-side relay transmission gear 40 b, and extends from the wheel body main body 41 a so as to be integrally rotatable on both lateral sides, and is externally fitted to the transmission shaft 42. The boss portion 41b is configured to be provided, and the output is provided via a bearing 45 interposed between the output wheel body support portion 12e provided at the extending end portion of the output case portion 12b in the feed case 12 and each boss portion 41b. The ring body support portion 12e is rotatably supported. A sealing member 46 is interposed between each boss portion 41 b and the output wheel body support portion 12 e, and the sealing member 46 located at each boss portion 41 b is on the side where the ring body main body 41 a is located with respect to the bearing 45. Are arranged in the direction opposite to the axis of the transmission shaft 42 in the axial direction. The extension length L of each boss 41b extending from the ring body 41a is set to an extension length at which the extension end projects from the seal member 46 to the side opposite to the side where the bearing 45 is located.

  As shown in FIGS. 2, 4, and 6, the transmission shaft 42 includes a transmission case 47 provided between the output case portion 12b of the feed case 12 and the planting drive case 11 adjacent to the output case portion 12b, and two adjacent transmission cases. It is accommodated in a transmission case 47 provided over the planting drive cases 11 and 11. The transmission shaft 42 is configured to be divided into eight divided transmission shafts 42a in the axial direction. The divided transmission shaft 42 a constituting the transmission shaft 42 is connected inside the output case portion 12 b of the feed case 12 and near the outside of the planting drive case 11. A pair of adjacent split transmission shafts 42a and 42a includes a connecting cylinder 48 and an output ring body 41 that are fitted over the pair of split transmission shafts 42a and 42a, and a boss portion 41b of the connection cylinder 48 and the output ring body 41, and each of them. A connecting key 49 provided between the divided transmission shaft 42a and the divided transmission shaft 42a is connected so as to be integrally rotatable.

  As shown in FIG. 2, a fractional planting clutch 50 is provided at the front end portion of the rotation transmission shaft 43 provided in each planting drive case 11, and a torque limiter is provided at the rear end portion of the rotation transmission shaft 43 provided in each planting drive case 11. 70 is provided.

  FIG. 7 is a cross-sectional plan view showing the fractional row planting clutch 50. As shown in FIGS. 6 and 7, the fractional planting clutch 50 provided on the rotation transmission shaft 43 of each planting drive case 11 includes a drive-side clutch body 51 and a driven-side clutch that are externally fitted to the front end portion of the rotation transmission shaft 43. A spring 54 that is externally fitted to the rotation transmission shaft 43 is provided between the body 52, the driven clutch body 52, and a spring receiving portion 53 provided on the rotation transmission shaft 43.

  The drive-side clutch body 51 is externally fitted to the rotation transmission shaft 43 in a state where the bevel gear portion 51 a meshes with a bevel gear 55 provided on the transmission shaft 42 so as to be integrally rotatable, and the bevel gear 55 is fitted from the transmission shaft 42. Is driven to rotate around the axis of the rotary transmission shaft 43 by the driving force transmitted through the shaft. The drive side clutch body 51 is rotatably supported by the support portion 11 a of the planting drive case 11 via a bearing 56.

  The driven side clutch body 52 is engaged with the rotation transmission shaft 43 so as to be integrally rotatable by engagement between a spline portion 52 a provided on the inner peripheral surface and a spline portion 43 a provided on the peripheral surface of the rotation transmission shaft 43. In this way, the rotary transmission shaft 43 is configured to slide in the axial direction while maintaining this engagement. The driven-side clutch body 52 is slid to the side where the drive-side clutch body 51 is located by an engaging operation by the urging force of the spring 54 and a cutting operation by the operation pin 61 against the operation by the spring 54. And a switching position in which the drive side clutch body 51 is slid in the opposite direction to the side where the drive side clutch body 51 is located.

  When the driven clutch body 52 is switched to the entering position, the driven side clutch pawl 52 b provided at the end of the driven side clutch body 52 and the drive side clutch pawl provided at the end of the drive side clutch body 51 are operated. 51b meshes with the drive side clutch body 51 so as to be integrally rotatable. When the driven-side clutch body 52 is switched to the disengagement position, the driven-side clutch pawl 52b and the driving-side clutch pawl 51b are disengaged, and the connection to the driving-side clutch body 51 is released.

  In other words, the fractionally planted clutch 50 is switched to the engaged state when the driven clutch body 52 is switched to the engaged position, and the drive force of the bevel gear 55 as the drive force of the transmission shaft 42 is changed to the drive clutch body 51. Then, the rotation transmission shaft 43 is driven by being transmitted to the front end portion of the rotation transmission shaft 43 through the driven clutch body 52. The driving force of the rotation transmission shaft 43 is transmitted from the rear end portion of the rotation transmission shaft 43 to the planting drive shaft 20 via the torque limiter 70.

  When the driven clutch body 52 is switched to the disengagement position, the fractional planting clutch 50 is switched to the disengaged state, and the driving force of the bevel gear 55 as the driving force of the transmission shaft 42 is transmitted to the rotation transmission shaft 43. And the rotation transmission shaft 43 is stopped. When the rotation transmission shaft 43 stops, the planting drive shaft 20 stops.

  Accordingly, each of the fractional planting clutches 50 is switched to the engaged state, whereby a pair of seedling planting mechanisms 6 supported by the planting drive case 11 including the rotation transmission shaft 43 with the fractional planting clutch 50 attached. , 6 are driven so as to perform seedling planting operation, and are switched to the cutting state, whereby only the pair of seedling planting mechanisms 6, 6 supported by the planting drive case 11 are stopped so as to stop planting.

  As shown in FIG. 6, each fraction planting clutch 50 is provided for each fraction planting clutch 50, and is configured to be switched by a clutch operating device 60 including the operation pin 61.

  The clutch operating device 60 of each fractional planting clutch 50 includes an operation unit cover 62 extending laterally outward from the planting drive case 11, an operation pin 61 slidably provided inside the operation unit cover 62, and an operation pin 61. A spring 64 provided inside the operation portion cover 62 and a clutch lever 66 that is linked to the operation pin 61 via an operation cable 65. It is configured. As shown in FIG. 1, the clutch lever 66 is swingably disposed on an operation panel 67 provided on the back surface side of the upper end portion of the seedling mount 7.

  By swinging the clutch lever 66 to the on position [on], the inner cable 65a of the operation cable 65 is pulled to pull the operation pin 61 against the spring 64, and the head 61a of the operation pin 61 is pulled. Moves to the outside of the planting drive case to release the supporting action of the driven side clutch body 52 with respect to the cam plate portion 52c, and the driven side clutch body 52 is switched to the entry position by the spring 54.

  By swinging the clutch lever 66 to the cut position [OFF], the inner cable 65a of the operation cable 65 is loosened, and the operation pin 61 is moved to the inward side of the planting drive case by the spring 64. The head 61a is aligned with the notch of the cam plate portion 52c, and the operation pin 61 pushes the cam plate portion 52c against the spring 54 to switch the driven clutch body 52 to the cut position. At this time, when the driven clutch body 52 is positioned so that the pair of planting claws 6d, 6d of the seedling planting mechanism 6 is located above the field scene, the head 61a of the operation pin 61 is moved from the cam plate 52c. It is configured to press the cam plate portion 52c to the cut side in conformity with the cut recess, and the fractional planting clutch 50 is positioned at the rotational phase where the pair of planting claws 6d, 6d are located above the field scene. A fixed position stop function for stopping the seedling planting mechanism 6 is provided.

  FIG. 8 is a cross-sectional plan view showing the torque limiter 70. As shown in FIGS. 6 and 8, the torque limiter 70 includes a drive-side clutch body 71 and a driven-side clutch body 72 that are fitted around the rear end portion of the rotation transmission shaft 43, and a spring receiving portion provided on the drive-side clutch body 71. A torque setting spring 74 that is externally fitted to the rotation transmission shaft 43 is provided between 71 a and a spring receiving portion 73 provided on the rotation transmission shaft 43.

  The driven-side clutch body 72 is engaged with a bevel gear portion 72a meshing with a planting drive gear 75 provided on the planting drive shaft 20 so as to be integrally rotatable, and is engaged with the inner peripheral side of the bevel gear portion 72a so as to be integrally rotatable by spline engagement. A clutch portion 72b that is externally fitted to the rotation transmission shaft 43 so as to be relatively rotatable is configured to interlock with the planting drive shaft 20 so as to be capable of transmission and to rotate relative to the rotation transmission shaft 43. The driven-side clutch body 72 is rotatably supported by the support portion 11b of the planting drive case 11 via a bearing 76 that is externally fitted to the clutch portion 72b.

  The drive-side clutch body 71 is engaged with the rotation transmission shaft 43 so as to be integrally rotatable by engagement between a spline portion 71 b provided on the inner peripheral surface and a spline portion 43 b provided on the peripheral surface of the rotation transmission shaft 43. And while maintaining this engagement, it slides in the axial center direction of the rotation transmission shaft 43.

  The drive side clutch body 71 is driven by the biasing force of the torque setting spring 74 when the drive load applied to the driven side clutch body 72 as the drive load applied to the planting drive shaft 20 is equal to or less than the set drive load by the torque setting spring 74. The side clutch body 72 is configured to be maintained in the entering position slid to the side where the side clutch body 72 is located. When the drive side clutch body 71 is maintained in the engaged position, a drive side clutch tooth portion 71c provided on the drive side clutch body 71 and a driven side clutch tooth portion 72c provided on the clutch portion 72b of the driven side clutch body 72 are provided. The drive force of the rotation transmission shaft 43 is transmitted to the driven clutch body 72 by meshing.

  When the drive load applied to the driven clutch body 72 becomes larger than the set drive load set by the torque setting spring 74, the drive side clutch body 71 has a cam action generated between the drive side clutch tooth portion 71c and the driven side clutch tooth portion 72c. Thus, it is configured to be operated to a cutting position that slides on the side opposite to the side where the driven side clutch body 72 is positioned against the torque setting spring 74. When the drive side clutch body 71 is operated to the disengaged position, the driven side clutch tooth portion 72c and the drive side clutch tooth portion 71c are disengaged, and the drive side clutch body 71 and the driven side clutch body 72 are disengaged.

  Therefore, the torque limiter 70 provided on the rotation transmission shaft 43 of each planting drive case 11 is a pair of seedling planting mechanisms 6, 6 supported by the planting drive case 11 including the rotation transmission shaft 43 with the torque limiter 70. When the driving load applied to the motor becomes larger than the set driving load by the torque setting spring 74, the interlocking of the rotary transmission shaft 43 and the planting drive shaft 20 is cut off by disconnecting the interlocking of the driving side clutch body 71 and the driven side clutch body 72. The drive of the pair of seedling planting mechanisms 6 and 6 supported by the drive case 11 is stopped.

  A spline portion 52 a provided to be engaged with the rotation transmission shaft 43 in the driven side clutch body 52 constituting the fraction-planting clutch 50 and a drive side clutch body 71 constituting the torque limiter 70 are engaged with the rotation transmission shaft 43. The spline portion 71b provided with the same spline module is configured so that the driven-side clutch body 52 of the rotation transmission shaft 43 engages with the spline portion 43b with which the drive-side clutch body 71 engages. The same production tool can be adopted for the formation.

  As shown in FIG. 6, a lubricating oil supply port 78 and a plug 79 for opening and closing the lubricating oil supply port 78 are provided in the wall portion 11 c facing the machine body of the planting drive case 11. As shown in FIG. 9, the lubricating oil supply port 78 is arranged at a higher arrangement height than the axis 20 a of the planting drive shaft 20, and the oil level height of the lubricating oil entering the planting drive case 11 is at least the planting drive shaft 20. The lubricating oil can be supplied so that the arrangement height is as follows.

[Another Example]
(1) In the above-described embodiment, the example in which the lubricating oil supply port 78 of the planting drive case 11 is provided at a higher arrangement height than the shaft core 20a of the planting drive shaft 20 is shown. It may be provided with the same arrangement height.

(2) In the above-described embodiment, the example in which the seedling planting mechanism 6 is provided on both sides of the planting drive case 11 has been described. However, even if the seedling planting mechanism 6 is provided only on one side of the planting drive case 11, Good.

(3) In the above-described embodiment, an example in which the seedling planting mechanism 6 including the rotary rotor 6a is provided has been described. However, the seedling planting mechanism including the swingable driving arm and one planting claw is provided and implemented. Also good.

(4) Although the example which provided the eight seedling planting mechanisms 6 was shown in the above-mentioned Example, you may implement by providing the seedling planting mechanisms of numbers other than eight, such as six and four.

  The present invention can be used for a rice transplanter configured as a walking type as well as a rice transplanter configured as a riding type.

6 Seedling planting mechanism 11 Planting drive case 11c Wall 20 Planting drive shaft 20a Shaft core 42 Transmission shaft 43 Rotation transmission shaft 43a, 43b Spline section 50 Fractional planting clutch 52 Drive side clutch body 52a Spline section 70 Torque limiter 71 Drive side clutch Body 71b Spline part 78 Lubricating oil supply port

Claims (3)

A seedling planting device of a rice transplanter comprising a plurality of planting front and rear planting drive cases arranged in a lateral direction of the machine body, and a seedling planting mechanism provided to be freely driven at a rear end portion of the plurality of planting drive cases,
In each of the plurality of planting drive cases, a transmission shaft located at the front end of the planting drive case and a planting drive shaft located at the rear end of the planting drive case for driving the seedling planting mechanism are linked. A rotary transmission shaft, a fraction-planting clutch provided at a front end portion of the rotary transmission shaft so as to switch transmission from the transmission shaft to the rotary transmission shaft between an on state and a cut-off state, the rotary transmission shaft and the planting drive shaft A seedling planting device for a rice transplanter provided with a torque limiter provided at a rear end portion of the rotary transmission shaft so as to switch between an interlocking state and an interlocking off state. The fractional planting clutch is configured to include a driven side clutch body that is integrally rotated and slidably engaged with the spline portion of the rotation transmission shaft by the spline portion,
The torque limiter includes a drive-side clutch body that is engaged with the spline portion of the rotation transmission shaft so as to be integrally rotated and slidable by the spline portion,
The seedling planting device for a rice transplanter according to claim 1, wherein the modules of the spline portion of the driven side clutch body and the modules of the spline portion of the driving side clutch body are set to be the same.   The seedling of the rice transplanter according to claim 1 or 2, wherein a lubricating oil supply port is provided at a wall portion facing the rear of the machine body of the planting drive case at the same or higher arrangement height with respect to an axis of the planting drive shaft. Planting equipment.

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